Author
Topic: 1969 Brake issues (Read 4349 times)

Greetings-I am having some issues with my brakes.I installed new brake lines-Master Cylinder-Booster-Proportioning valve-metering block, attempted to bleed the brakes and the pedal is permanently in the up position, no movement at all?I bench bled the MC and am unsure where to go from here?

Is the booster to master cylinder rod the correct length? Try loosening the MC from the booster and see if you get any pedal play. If it's rock hard like you say something is askew between the pedal and MC. Your description sounds like the MC piston is being buried.

Is the booster to master cylinder rod the correct length? Try loosening the MC from the booster and see if you get any pedal play. If it's rock hard like you say something is askew between the pedal and MC. Your description sounds like the MC piston is being buried.

MC was loosened and the pedal moves-appears the rod is not the correct length,what length should the rod be?

Compare the old MC to the new one and see if the piston locations in the back are the same. Is this a conversion kit you are installing by any chance? Like I said, something is amiss. Obviously right?.

locations the same and this is a replacement Delco Moraine Booster and MC from firewheel classics.The original MC was not the right one and the P Valve was missing, everything worked good though.it has original front disc and rear drum.

I have to ask again. Is the piston on the back of the MC flush or recessed? Are the old and the new the same in this aspect? Flush gets short rod, recessed gets long rod. If the system worked before as you say something is assembled incorrectly or the parts are wrong which is binding/holding the pedal in the up position. It sounds as if the rod is too long and when you tighten the MC to the PB it's burying the piston in the MC.